Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 153-160.doi: 10.12108/yxyqc.20230515

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

A new method for calculating dynamic reserves and water influx of water-invaded gas reservoirs

YUE Shijun1, LIU Yingru1, XIANG Yiwei2, WANG Yulin1, CHEN Fenjun2, ZHENG Changlong1, JING Ziyan1, ZHANG Tingjing1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China
  • Received:2023-02-20 Revised:2023-03-27 Online:2023-09-01 Published:2023-09-28

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Abstract: Taking a homogeneous radial gas reservoir with edge water as an example，based on the material balance theory of water drive gas reservoirs，the relationship between the average water saturation of the formation and the exit-end water saturation was derived. Water storage volume coefficient was introduced to establish the relationhsips of average water saturation with dynamic reserves and water influx of gas reservoirs，so as to calculate the dynamic reserves and water influx of gas reservoirs. This method was applied to the sixth layer of Quaternary Sebei Formation in Tainan gas field of Qaidam Basin，the dynamic geological reserves were verified using the apparent geological reserves method，and the calculation results of water influx were verified using numerical simulation method. The results show that：（1）In homogeneous radial gas reservoir with edge water，the average water saturation of the formation is linearly positively correlated with the exit-end water saturation.（2）When calculating the dynamic reserves of gas reservoirs through average saturation，the data that tends to stabilize in the middle and later stages of development should be selected. At this time，the pressure drop of the formation affects the reservoir boundary，which can reflect the real dynamic reserves of the entire work area. However，the results calculated by early data are relatively small.（3）The dynamic geological reserves of the sixth layer of Quaternary Sebei Formation in Tainan gas field of Qaidam Basin calculated by average saturation are 8.1×108 m3，with an error of 1% compared with the dynamic geological reserves calculated by apparent geological reserves method. The error between the water influx calculated by average saturation and the water influx calculated by numerical simulation method is about 10%.

Key words: water-invaded gas reservoirs, dynamic reserves, material balance, fractional flow theory, average water saturation, water influx, radial formation, Tainan gas field, Qaidam Basin

CLC Number: 

  • TE341
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